Enzyme that catalyzes the serial addition of monomers to synthesize a polymeric biomolecule. This term usually applies to DNA/RNA polymerases which synthesize these nucleic acid polymers from mononucleotides.

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First RNA polymerase-mRNA

We know that RNA polymerase produces mRNA by reading DNA strand. Which enzyme produces the first RNA polymerase if other RNA polymerases are synthesized in the same way like other enzymes(proteins) ?
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Why is DNA replication performed in the 5' to 3' direction?

DNA replication goes in the 5' to 3' direction because DNA polymerase acts on the 3'-OH of the existing strand for adding free nucleotides. Is there any biochemical reason why all organisms evolved to ...